134 lines
3.5 KiB
Bash
Executable File
134 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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# _____ _ _
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# | __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
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# | __| _| -_| -_| . | . | | . | . | | -_|
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# |__| |_| |___|___|___|___|_|_|_|___|___|_|_|___|
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#
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# Freedom in the Cloud
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#
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# Enables or disables zram
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#
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# License
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# =======
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#
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# Copyright (C) 2015-2018 Bob Mottram <bob@freedombone.net>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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PROJECT_NAME='freedombone'
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export TEXTDOMAIN=${PROJECT_NAME}-zram
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export TEXTDOMAINDIR="/usr/share/locale"
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DAEMON_FILENAME=/etc/systemd/system/zram.service
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function zram_daemon {
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{ echo '[Unit]';
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echo 'Description=Zeronet Server';
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echo 'After=syslog.target';
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echo 'After=network.target';
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echo '[Service]';
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echo 'Type=simple';
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echo 'User=zram';
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echo 'Group=zram';
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echo 'WorkingDirectory=';
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echo "ExecStart=${PROJECT_NAME}-zram on";
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echo '';
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echo '[Install]';
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echo 'WantedBy=multi-user.target'; } > $DAEMON_FILENAME
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}
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function zram_on {
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if [ ! -f $DAEMON_FILENAME ]; then
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if ! grep -q "options zram num_devices=1" /etc/modprobe.d/zram.conf; then
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echo 'options zram num_devices=1' >> /etc/modprobe.d/zram.conf
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fi
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# get the number of CPUs
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num_cpus=$(grep -c processor /proc/cpuinfo)
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# if something goes wrong, assume we have 1
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[ "$num_cpus" != 0 ] || num_cpus=1
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# set decremented number of CPUs
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decr_num_cpus=$((num_cpus - 1))
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# get the amount of memory in the machine
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mem_total_kb=$(grep MemTotal /proc/meminfo | grep -E --only-matching "[[:digit:]]+")
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mem_total=$((mem_total_kb * 1024))
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# load dependency modules
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modprobe zram num_devices=$num_cpus
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# initialize the devices
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for i in $(seq 0 $decr_num_cpus); do
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echo $((mem_total / num_cpus)) > "/sys/block/zram$i/disksize"
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done
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# Creating swap filesystems
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for i in $(seq 0 $decr_num_cpus); do
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mkswap "/dev/zram$i"
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done
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# Switch the swaps on
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for i in $(seq 0 $decr_num_cpus); do
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swapon -p 100 "/dev/zram$i"
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done
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zram_daemon
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fi
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}
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function zram_off {
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if [ -f $DAEMON_FILENAME ]; then
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# get the number of CPUs
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num_cpus=$(grep -c processor /proc/cpuinfo)
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# set decremented number of CPUs
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decr_num_cpus=$((num_cpus - 1))
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# Switching off swap
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for i in $(seq 0 $decr_num_cpus); do
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if [ "$(grep "/dev/zram$i" /proc/swaps)" != "" ]; then
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swapoff "/dev/zram$i"
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sleep 1
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fi
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done
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sleep 1
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rmmod zram
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rm $DAEMON_FILENAME
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fi
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}
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function show_help {
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echo ''
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echo $"${PROJECT_NAME}-zram [on|off]"
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echo ''
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exit 0
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}
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if [ ! "$1" ]; then
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show_help
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else
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if [[ "$1" == "on" || "$1" == "enable" || "$1" == "yes" ]]; then
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zram_on
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else
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zram_off
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fi
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fi
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exit 0
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